Paul was not allowed to work he was fully recovered from the flu.
A. even if
B. whether
C. because
D. until
网友回答
A. even if
B. whether
C. because
(答案→)D. until
解析： A. even if即使，B. whether是否，C. because因为，D. until直到，句意：Paul不被允许工作直到他的流感完全恢复。这里使用了not…until…“直到…才…”，选D。